Serum vitamin clevel in children exposed to environmental tobacco smoke Lipoxygenase and leukotriene A4 hydrolase expression in primary nephrotic syndrome. Isolated mitral valve prolapse in children Leptin concentration in cord blood: relationship to insnlin leve , birth weight, gender and prematurity Prevalence and risk factors of abnormal urinary albumin excretion among children with insulin dependant diabetes Correlative study of ultrasongraphic features with clinincal measures in juvenile rheumatoid arthritis Early experience with totally implantable venous access port system for [ediatric cancer patients. Evaluation of serum and intracellular magnesium leveis in asthmatic children and correlation with severity